Long-term Trends of Visibility and Air Quality in Seoul, Ganghwa, Susan, Gwangju, Jeju

서울, 강화, 서산, 광주, 제주지역에서의 장기간 대기오염 및 시정 변화경향에 대한 연구 : 1990년 1월~2001년 7월

  • Han, J.S. (Dept. of Atmospheric Chemistry, National Institute of Environmental Research) ;
  • Moon, Kwang-Joo (Dept. of Atmospheric Chemistry, National Institute of Environmental Research) ;
  • Kong, B.J. (Dept. of Atmospheric Chemistry, National Institute of Environmental Research) ;
  • Hong, Y.D. (Dept. of Atmospheric Chemistry, National Institute of Environmental Research) ;
  • Lee, S.J. (Dept. of Atmospheric Chemistry, National Institute of Environmental Research) ;
  • Shin, J.Y. (Meteorological Research Institute, Korea Meteorological Administration)
  • 한진석 (국립환경연구원 대기화학과) ;
  • 문광주 (국립환경연구원 대기화학과) ;
  • 공부주 (국립환경연구원 대기화학과) ;
  • 홍유덕 (국립환경연구원 대기화학과) ;
  • 이석조 (국립환경연구원 대기화학과) ;
  • 전영신 (기상청 기상연구소)
  • Received : 2004.06.30
  • Accepted : 2004.08.12
  • Published : 2004.08.31

Abstract

Visibility impairment was known as an indicator of the increased air pollution. In many previous studies, it is known that both directly emitted fine particles mainly from vehicles and secondary aerosols from photochemical reactions could contribute to this visibility impairment in addition to the meteorological condition. Furthermore, the visibility showed different change patterns according to the geographical condition. In order to research into the influence of these factors on visibility, this study analyzed the visibility at 15:00, observed from 1990 to 2001 in Seoul, Ganghwa, Susan, Gwangju, Jeju. As a result, the visibility was increased in Seoul except the rainfall period, but in Susan, Gwangju, Jeju, it decreased with the relative humidity (RH). Especially, in Seoul, the number of low visibility days was larger than other sites and variations of the visibility were sensitive to the concentration of air pollutants, such as TSP, $NO_2$, $O_3$. The visibility impairment was mainly observed in meteorological condition of RH<50% and relatively stationary front. Therefore it is inferred that photochemical smog could lead to the low visibility in Seoul. On the other hands, in Ganghwa and Susan, when RH was 60~70%, the low visibility observed under the influence of the transports of air pollutants from nearby cities as well as humid air mass from coastal region. And in Jeju, sea fog and humid air mass caused the visibility impairment when the RH was larger than 80%. Finally, during the observational period, some cases of low visibility phenomena were simultaneously observed in the vast region including Seoul, Susan, Ganghwa. It not only includes the visibility aggravation by Asian Dust, but also could be caused by the movement and diffusion of flying dust or secondary aerosols. Moreover, the result shows that these phenomena could be mainly influenced by meteorological factors covering the wide regions.

Acknowledgement

Supported by : 국립환경연구원

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